Marsh McLennan

Disclosed Jun 30, 2021Confirmed

What is known

People affected	Not stated in the sources we have
Disclosed	Jun 30, 2021
Discovered	Apr 26, 2021
Happened	Apr 22, 2021
Attack	Hacking
Data exposed	Not stated
Sector	Finance · US
Status	Confirmed

Sources

Official noticeoag.ca.gov

California Attorney General breach notice: Marsh McLennan

Official noticeatg.wa.gov

Washington Attorney General breach notice: Marsh McLennan

Official noticejustice.oregon.gov

Oregon DOJ breach notice: Marsh McLennan

Official noticein.gov

Indiana Attorney General 2021 data breach report: Marsh McLennan

Notices filed

Residents of CAJun 30, 2021

California AGCount not stated

Residents of WAJun 30, 2021

Washington AG2,550 people

Residents of INJun 30, 2021

Indiana AG943 people

Residents of ORJul 1, 2021

Oregon DOJCount not stated

History of this record

source2026-09-25

empty to https://www.in.gov/attorneygeneral/consumer-protection-division/id-theft-prevention/files/Data-Breach-Year-to-date-Report-2021-1.pdfby backfillSource

sector2026-09-25

other to financeby backfillSource

attack2026-09-25

unknown to hackingby backfillSource

discovered2026-09-25

empty to 2021-04-26by backfillSource

Added2026-09-25

First recordedby backfillSource

First seen 2026-09-25 (California AG), confirmed by California AG. Record counts are as reported. Not legal advice.

Everything about Marsh McLennan